Question

1.) The pile load test data of a 300 mm diameter and 15 m long
pile is as

follows . Design a pile group system to carry a load of 4000 kN.
Compute

the settlement of the pile group for the designed load.

Load in kN |
0 | 500 | 1000 | 1500 | 2000 | 2500 |

Settlement in mm |
0 | 8.5 | 16.5 | 25.5 | 38.0 | 60.0 |

2.) Design a retaining wall for a 8 m sandy soil backfill with unit
weight as

17.5 kN/m^{3} and angle of internal friction 30 degrees.
Check the stability

of the designed retaining wall.

Answer #1

A pile group of four identical piles are connected to
a rigid pile cap. Diameter of each pile is 0.8 m and a load test
gave a settlement of 15 mm under a load of 500 kN. Poisson's ratio
of the soil is 0.5 and it can be assumed that the rigid stratum
lies far below the base of the piles. Pile stiffness factor is
2000. The spacing between piles is 1.5 m and the embedded depth is
8 m....

Design a wall footing to support a 300 mm reinforced concrete
wall with dead load of 292KN/m and live load of 200 KN/m. The
bottom of the footing is 1.20 m below the final grade, the soil
weighs 15,700 N/m3. The allowable soil pressure is 190 Kpa. fy =
276.5 Mpa, fc’ = 27.6 Mpa.

A
concrete pile 1-m diameter is driven 15-m in dense sand with
following properties: γ=17.5 kN/m3, φ=30o, K=0.90 and FS=3. Water
is 5-m below the ground surface. Use typical values for any missing
data. What is the design load for this pile?

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